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THE ROYAL SOCIETY OF CANADA 



The liquid remaining in the. tubes after the last settling was 

 used as the soil solution. 



An open arm mercury manometer was then attached to each 

 tube and the tubes were placed in distilled water. 



After the observations on the pressure had been completed, the 

 electrical resistance of the soil solutions was compared to that of a 

 •02N. KC1 solution. 



We made two separate experiments and repeated the second 

 experiment twice using the same soil and solution as in the second 

 experiment. 



Results. 



Table I. 



GIVING THE OSMOTIC PRESSURE OBSERVED IN THE FIRST EXPERIMENT. 



Duration of experiment 14 days; depth of soil columns (1) 7 

 cms.; (2) 4 cms. Resistance of soil solutions compared to -02N. 

 KC1 solution. Soil solution 70 ohms, -02N. KC1 solution 270 ohms 

 at 18°C. 



Table II. 



GIVING THE OSMOTIC PRESSURE OBSERVED IN THE SECOND EXPERIMENT. 



Duration of experiment 6 days; depth of soil column (we forgot 

 to take this but it was approximately 6 cms.) Electrical resistance 

 of soil solution =60 ohms., -02N, KC1 = 270 ohms, at 18°C. 



